package com.zhoukx.facade;

/**
 * @ClassName Screen
 * @Description:
 * @Author zhoukx
 * @Date 2020/8/10
 **/
public class Screen {
    private static Screen instact = new Screen();

    public static Screen getInstance() {
        return instact;
    }


    public void up() {
        System.out.println("屏幕 up .........");
    }

    public void down() {
        System.out.println("屏幕 down .........");
    }




}
